521744245421 has 32 divisors (see below), whose sum is σ = 602021376000. Its totient is φ = 442928977920.

The previous prime is 521744245403. The next prime is 521744245469. The reversal of 521744245421 is 124542447125.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-521744245421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521744247421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 395559800 + ... + 395561118.

It is an arithmetic number, because the mean of its divisors is an integer number (18813168000).

Almost surely, 2^521744245421 is an apocalyptic number.

It is an amenable number.

521744245421 is a deficient number, since it is larger than the sum of its proper divisors (80277130579).

521744245421 is a wasteful number, since it uses less digits than its factorization.

521744245421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2609.

The product of its digits is 358400, while the sum is 41.

The spelling of 521744245421 in words is "five hundred twenty-one billion, seven hundred forty-four million, two hundred forty-five thousand, four hundred twenty-one".